When did tv sets becamed more relaible and why?

[Alex KL-1]

(Now I posted on correct thread):
Only for amusing, I only imagine perhaps a tube-based TV with modern resistors, capacitors and flyback/coils, with nowadays better stable mains, if reliability will be better than in it's days. At least for audio products, with modern parts, I can only need to change tubes when the tube are with problem, and not a problem caused by a bad resistor or (paper) capacitor cooking the tube (in the bias circuits for example). Of course, TV have far more tubes and resulting heat, but even so... (only for illustrating the contribution of passive parts)